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=== Corrupted Data File / Mail Folder File ===SCANPST.EXE is the Inbox Repair Tool provided by Microsoft and designed to sometimes automatically correct problems. Find it in the same directory that Microsoft Outlook is installed such as c:\Program Files\Microsoft Office. Launch it from file explorer and once running select the PST file. It will test the PST file for errors and give you a repair option if it finds one. Do not simply run it one time if it did indeed find errors. After each fix attempt you must run it again. Continue this cycle until it runs and finds no more errors. After about five runs it should have the job done. If not you will have to consider giving up.SCANPST.exe is used to scan the Offline Data File (OST) of Outlook when used as an Exchange client in cached mode. This is only if you are connected to an exchange server. If you are a POP or IMAP user then disregard. Even if you use an Exchange server you probably don't care about the exchange cache file unless you have been away from the office and working offline. === Huge Over-Sized Data File / Mail Folder File ===You can't save everything!!!! When all of the messages and attachments in your Outlook exceeds a certain point, right around the 2GB mark, Outlook becomes very ill. The Inbox Repair Tool can't help you if you have a 2GB or larger PST file and it is corrupted. Now we need to do a hatchet job and blindly chop off the bottom (or the oldest stuff if all goes well). This is not an ideal option but better than being locked out or losing it all.PST2GB.exe will attempt to fix the situation by truncating the PST file so it will be at a manageable size. The truncated data is not recoverable. After you run PST2GB you'll want to run SCANPST against the file as many times as necessary to get a clean scan. Then fire up Outlook and see if you got lucky.PST2GB is not included with our Outlook installation because Microsoft is afraid you might run with scissors in your hand. Download it from Microsoft. I would put the link here but about once a month Microsoft rearranges their web site and all links to Microsoft become broken (they are turds). Do a search for it and download from Microsoft only (no 3rd party web sites.)Safe ModeIf Outlook is crashing for no obvious reason one thing to try is to start the program in Safe Mode. To do that just press and hold the CTRL key on your keyboard while you click the icon to start Outlook.If the problem doesn't appear when you're running in Safe Mode then it's probably a misbehaving add-in that's causing the issue. Go to Tools | Trust Center | Add-ins and see if there's anything there you can disable. One that I almost always disable is the iTunes add-in. It's really only useful if you're synchronizing Outlook to your iPhone or iPod.You can also start in safe mode by using the /safe command line switch. Don't know how to do that? Keep reading...Command Line SwitchesYou can control how Outlook starts, and do some nifty troubleshooting, by using some of the built-in Command Line Switches for Outlook. To use a command line switch just exit Outlook (if it's already running) and then click Start | Run. In the Run dialog box that appears type "Outlook" followed by a space and then the switch you want to use. For example:Outlook /cleanremindersHere are a few of the particularly useful command line switches you might want to use: /Cleanreminders - If you have pesky calendar issues, especially with ghost reminders, start Outlook with this switch and it will delete all of the reminders from you profile and then recreate them from your items. /CleanViews - Resets the Outlook views to the default set that Outlook comes with. CAUTION: any custom views you've created will be lost if you do this and you'll have to recreate them. Still, this is often a way to fix Outlook startup crashes. /Resettodobar - Problems with the To Do Bar in Outlook 2007 or 2010? This switch is handy if you're seeing problems like duplicate items or formatting problems with the To Do Bar. It cleans and regenerates the To Do Bar. /Resetfoldernames - If you somehow managed to rename one of your default folders you can use this switch to have all of your default folders changed back to their original names. This doesn't affect the content of the folders, just renames them. /Resetfolders - If you did more than just rename the folder but actually DELETED one of the default folders...this will recreate any missing default folders at their original location. /ResetNavPane - Cleans and regenerates the navigation pane. If you're not seeing what you expect to see in your navigation pane this will reset it and can fix quirky problems with the Nav pane. This can also be the cure for unexpected startup failures in Outlook on occasion.