I'm currently using Outlook 2011 for Mac Yosemite 10.10.1.

Earlier today, I did 2 things to try and reduce the amount of stored files on my hard drive: 1) I went to "Library > Caches" on my Mac and removed cached "Microsoft Office" files (I don't know exactly what these files were for but I should have backed them up first) and 2) I transferred about 95% of the "Documents" folder contents onto an external hard drive.

Then, after opening Outlook, I saw that none of the calendar items, mail files, or anything else was there... I restored the files from the ext hard drive back into the documents folder but that didn't help. I think deleting the cached files caused the problem.

What can I do? Does Microsoft back-up your Outlook 2011 files? And if so, how can I restore them?