All of the major digital maps contain erroneous information about our street in Virginia, and don’t even show several new streets near our home that were built over three years ago. I infer that there is one source of cartography used by these Web services, and also by my Garmin navigation system. But I can’t find out what it is. How can an individual get something like this corrected?

There are actually two main companies that make the underlying maps that most of the navigation-device makers and digital-map sites use. One is called Tele Atlas (TLATF.PK), and one is called Navteq (NVT). Garmin (GRMN) uses Navteq. Each mapping company has a Web page where users can report errors or changes.

For Navteq’s error-reporting Web page, go to navteq.com and click on “Map Reporter.” For Tele Atlas’ similar page, go to teleatlas.com and click on “Report Map Changes.”

In reading your review of the new Gogo in-flight wireless Internet system, I wondered about two things: Does it support “virtual private networks,” and when will it be installed on Amtrak trains?

While I didn’t test this, Gogo’s maker, Aircell, says that VPNs, which are used by many big companies, do indeed work over the service.

As for Amtrak, the Gogo system wouldn’t work for trains, because its antennas point up, into the sky, and don’t cover ground locations like railroad tracks. However, if you are on an Amtrak train in an area where cellphone towers are near the tracks, and your laptop computer or cellphone can pick up cellular data signals, you can already surf the Web and do email and other online tasks on the train.

In fact, I happen to be writing this column on an Amtrak Acela train between Washington and New York, and, using a Verizon (VZ) laptop card, my laptop is able to access the Internet with only occasional lapses.

Because of problems I had with my computer, I lost my Internet Explorer favorites. How can I save them so I can easily restore them if they get wiped out again?

There are several methods. You should, of course, be backing up all your key data, including your browser favorites or bookmarks, regularly, either to a local external disk, or to an online backup service. That would create a fairly fresh backup of your favorites. You could also use one of several Web sites that specialize in hosting, and sharing, bookmarks or favorites. They allow you to add bookmarks to your online list as you surf, and also to upload and download the favorites and bookmarks you keep locally on your computer. The best known of these sites is probably del.icio.us, which is at http://del.icio.us.

The simplest method, however, is probably to just export your favorites to a file and save it in your Documents folder, on your desktop, or on a USB thumb drive. You can then use this file to restore your favorites in case of disaster. To do this in the latest version of Microsoft (MSFT) IE, click on the “Add to Favorites” button, select “Import and Export,” click “Next,” then click “Export Favorites” and walk through the steps that follow. Detailed instructions for all versions of IE are at: support.microsoft.com/kb/211089.

• You can find Mossberg’s Mailbox, and my other columns, online for free at the new All Things Digital web site, http://walt.allthingsd.com.

Does any PC manufacturer offer an option to order a Windows (MSFT) PC without any extra software preinstalled?

Dell’s XPS models can be ordered without most preloaded third-party software if you are very careful about clicking all the “no” options when ordering online. But you still are likely to find yourself with Dell’s (DELL) own sometimes annoying networking software.

I have two Windows machines, one for work and one for home. Both use Outlook for email. How can I best transfer many emails from the machine at work to the one at home and still be able to read them in Outlook — without forwarding them all?

Outlook has an “Import and Export” function that will allow you to export any of your email folders to, say, a transferable medium such as an external hard disk or flash drive. You can then take this removable medium to the home computer, plug it in, fire up Outlook, and then import the folder you had exported earlier at work. You can find these import and export functions under Outlook’s File menu.

Can Internet Explorer and Firefox 3.0 coexist on the same computer?

Yes. In fact, you can have 2, 3, or 4 different Web browsers installed on the same personal computer, whether Windows or Mac (AAPL). You can even run different browsers simultaneously. For instance, as I type this, I am running IE 7, Firefox 3.0 and Safari 3.0 on the same computer at the same time.

The only slight hassle is that you will have to decide which to designate as the default browser, the one that launches when, say, you click on a link in an email.

• You can find Mossberg’s Mailbox, and my other columns, online for free at the new All Things Digital web site, http://walt.allthingsd.com.

There isn’t yet a Guinness World Record for most software downloaded in a single day, so Mozilla will truly have rewritten the record books if it manages to set one. The group’s hoping for 5 million downloads–not an unreasonable figure, given that Firefox 2 was downloaded 1.6 million times the first day of its release. Indeed, Mozilla’s already well on its way to reaching that goal: 1,721,775 users had already pledged to download the browser upon its release today at 10 a.m. PDT.

What can they expect from Firefox 3? More sophisticated bookmarking, endless customization possibilities, an “awesome bar,” more robust malware protection and a browsing experience that Mozilla claims is seven times speedier than Microsoft’s (MSFT) Internet Explorer. Said Walt Mossberg, “Firefox 3.0 is the best Web browser out there right now” and that it “tops the current versions of both IE and [Apple's (AAPL)] Safari in features, speed and security.”

Clearly, Firefox 3.0 is a force to be reckoned with now more than ever before. As of May, the browser’s worldwide market share was 18.4%, while Internet Explorer’s stood at 73.8% according to Web metrics company Net Applications. Where will it stand after setting that world record?

The once-frustrating process of sharing digital photos and videos has noticeably improved over the past year, thanks to seamless Web-based programs that work like desktop applications. But many of these sites give all the power to whoever created the album, leaving invited guests to simply look at photos or add comments.

Shwup by muvee Technologies gives friends a common album in which to share digital photos and videos.

This week I tested shwup (www.shwup.com), a free Web-based application that’s available starting Wednesday from muvee Technologies and works as described above with only a few pitfalls. The concept is simple: Anyone who signs up for a shwup account can create an album filled with digital photos and videos, and this album can be shared with anyone else via email whether they have a shwup account or not. Recipients of these email invitations can click on an embedded link to view and add content to the album. Or users can completely skip visiting the site and instantly upload content by replying to the email invitation with attached photos and videos.

Muvee Technologies is best known for selling software that automatically creates short movies, or muvees, by blending digital videos and photos with music and transitions. Muvee’s namesake technology is a part of the free shwup site; a few muvees are automatically generated in each of the albums and everyone who is invited to the album can create muvees using its content. But shwup’s main focus is making sharing easier for everyone. It differs from most of the company’s software programs in that it’s free and completely Web-based.

A shwup album takes just a few minutes to set up and even less time to share. It works on Microsoft’s (MSFT) Internet Explorer and Mozilla’s Firefox 2.0 and 3.0 browsers but won’t work on Apple’s (AAPL) Safari until the fall. Shwup is available Wednesday but is still technically in its beta, or testing, phase, and I ran into a few kinks. I had trouble getting its useful reply-to-email uploading capability to work when two friends and I tried to upload content to my album using attachments in email replies. My friends had to visit the site to upload content. Muvee couldn’t figure out what went wrong when I asked the company about it.

I did, however, add content to someone else’s album using the reply-to-email method, uploading a digital photo in seconds. And in another instance I received a shwup email invitation on my BlackBerry and replied to it with an attached photo, which — in seconds — sent that photo from my BlackBerry to the specified shwup album.

Shwup automatically makes muvees, or short movies with music and transitions, using album content.

A glaring omission from shwup is the ability to view photos in full-screen view, a feature that most photo-sharing programs offer in slideshow mode. A friend of mine said he would use shwup over other photo-sharing Web sites that require user names and passwords if only it had full-screen photos. Muvee recognizes this as one of shwup’s biggest issues and says it will add this feature in August.

I uploaded over 60 high-resolution digital photos into my first shwup album, noting that the only limitation on files is that no individual file can be larger than 100 megabytes. These images can come from your computer, Flickr, Facebook or any Web site. Out of curiosity, I plugged www.cnn.com into the Web site entry box and shwup automatically grabbed images from the site that were available for me to use. I checked two of the images and they were added to my album in seconds.

Shwup automatically made and added three muvees to my album, using my photos put to music it chooses with dramatically timed transitions. These short clips looked really well-done, and were labeled as “sample muvees” so as not to be confused with my content. I followed a few simple steps to create a muvee of my own for the album by dragging photos into a tray, choosing from seven different layout styles and a handful of stock music licensed by shwup.

An option lets you upload your own music to play with your muvee, which I did. Seconds later, my homemade muvee played with transitions that were perfectly timed to the beats of a Fountains of Wayne song. After filling an album with digital photos, videos and muvees that I made, I invited friends to my album using emails generated from shwup.com. Within each album, a clear list of whoever was invited to the album can be seen on the top right side of the page. If someone hasn’t shared content yet, he or she can be “poked” by anyone invited to the album, sending them yet another email invitation.

Everyone invited to an album receives notifications from shwup whenever someone contributed content to the album and everyone can change the layout of the album to one of three settings: Grid, Simple or Mosaic. Moving my cursor over an album’s images showed data about each file including who contributed the photo or video, when it was captured and how many comments it had received in the album. (Comments are readable after clicking on an image to see a bigger version of it.)

Digital videos are labeled with small Play icons to distinguish them from digital still images. But a friend who uploaded a video to my album pointed out that the still image representing his video was a gray square rather than a still of the first scene as it did with the other videos — perhaps because this is where the camera was focused at the start of the video. Without an image to illustrate what the video was, it wasn’t as appealing as the other videos and images. Muvee explained that the ability to select a still image to represent a video was available in its pay software, but not yet in shwup, though the company plans to add this to shwup in the future.

Another hitch: If you invite someone to your album and then add something to the album you’d rather they not see, you can’t un-invite the person. Muvee says it plans to add the ability to un-invite members in July. Individual contributors have the ability to delete or “unshare” the content that they added to an album, while album creators can unshare and delete all pictures or entire albums. Album creators also are given the authority to merge albums.

Along with shwup, muvee also announces a new version of its downloadable pay software Wednesday: muvee Reveal. This $100 software has much more detailed features that specifically tweak your videos to become extra personalized.

When it works, shwup serves as a neat, artistic way to share photos quickly. Friends and family will be relieved that it doesn’t require any forgettable usernames and passwords, and the email-uploading tool will make anyone who knows how to attach something to an email feel like he or she can contribute to a photo-sharing Web site without a second thought. After shwup adds its full-screen photo-viewing option and clears up the glitches of its email-uploading feature, I’ll be using shwup for many group events to come.

Edited By Walter S. Mossberg

• Email mossbergsolution@wsj.com