File Extension Search

.oab File Extension

Developer: Microsoft Corporation
File type: Data File
You're here because you have a file that has a file extension ending in .oab. Files with the file extension .oab can only be launched by certain applications. It's possible that .oab files are data files rather than documents or media, which means they're not meant to be viewed at all.

what is a .oab file?

The OAB file extension is known as Offline Address Book and contains names, e-mail addresses, and other contact information for Microsoft Outlook. Files in OAB format can be opened with Microsoft Outlook 2010 in Microsoft Windows platforms. Outlook does not have to be connected to the server to obtain a user's details. Instead, Outlook obtains such information from the local OAB. A user can possibly deploy OAB files manually to minimize performance issues. The Offline Address Book (OAB) stores all the properties of an Outlook user, like her name, email address, phone number and company alias. It enables you to write email to specific people that are sent when Outlook connects to the Internet again. To download OAB, Open Microsoft Outlook. Make sure you are connected to the Internet and to your Exchange Server. Click the "Tools" menu item. Scroll to "Send\Receive" and then select "Download Address Book." Then, Choose "Full Details" under "Information to download."

how to open a .oab file?

Launch a .oab file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .oab file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .oab files aren't yet associated with it. In this case, when you try to open a .oab file, you can tell Windows which application is the correct one for that file. From then on, opening a  .oab file will open the correct application. Click here to fix .oab file association errors

applications that open a .oab file

Microsoft Outlook Express

Microsoft Outlook Express

Outlook Express is an email and news client that is integrated with Internet Explorer versions 4.0 through 6.0. It is also bundled with a number of versions of Microsoft Windows, from Windows 98 to Windows Server 2003, and is available for Windows 3.x, Windows NT 3.51, Windows 95 and Mac OS 9. In Windows Vista, Outlook Express was outdated by Windows Mail, then again by Windows Live Mail as separate software in Windows 7. Microsoft Entourage, sold as part of Microsoft Office for Macintosh, has changed the Macintosh version. Outlook Express is a diverse application from Microsoft Office Outlook. The two programs do not share a common codebase, but do share a common architectural philosophy. The similar names lead many people to incorrectly conclusion that Outlook Express is a stripped-down version of Microsoft Office Outlook. Outlook Express utilizes the Windows Address Book to store contact information and incorporates tightly with it. On Windows XP, it also joins together with Windows Messenger.
Microsoft Office Outlook

Microsoft Office Outlook

Microsoft Outlook is available as a part of the Microsoft Office suite, and a personal information manager from Microsoft. The present version is Microsoft Office Outlook 2010 for Windows and Microsoft Office Outlook 2011 for Mac. Although frequently used primarily as an email application, it also includes a calendar, task manager, contact manager, note taking, a journal and Web browsing. It can be utilized as a stand-alone application, or can work with Microsoft Exchange Server and Microsoft SharePoint Server for many users in an organization, such as shared mailboxes and calendars, exchange public folders, SharePoint lists and meeting schedules. There are third-party add-on applications that integrate Outlook with electronic devices such as BlackBerry mobile phones and with other software like Office & Skype Internet communication. Developers can also make their own conventional software that works with Outlook and Office components using Microsoft Visual Studio. Moreover, Windows Mobile devices can synchronize almost all Outlook data to Outlook Mobile.

a word of warning

Be careful not to rename the extension on .oab files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

what is a file extension?

A file extension is the set of three or four characters at the end of a filename; in this case, .oab. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.

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