Will i loose data, in outlook mails  when i upgrade from OS X 10.9.5 to Yosemite

i am using a mac pro late 2013 version. at presen have os x 10.9.5, looking forward to update to OS yosemite. i am afraid that i would loose my data in my computer, especially will my outlook mails will be deleted . need to know wether we will loose data while upgrading the OS.

A few users have reported data loss while upgrading Mac OSX or even after updating Office. So, the best practice would be to export all email data in OLM format using outlook and also to save a copy of Microsoft User Data folder with Main Identity at a separate location such as a portable Hard drive and then only update the Mac OSX or outlook. This way if you face any issues, you have an option to go back to mavericks and get the things working exactly as they are now or alternately recover emails from the backup if you wish to stay on new OS.
I also upgraded to Yosemite and lost many outlook files and folders. I did not had any backups and was stuck completely. I researched and came to know that outlook stores messages in olk14 format. Then, I looked online for olk14 message recovery as I had some very important emails downloaded in outlook and didn't expect it to stop functioning by just upgrading Mac OSX. However, at a later stage I was able to recover messages from olk14 format. Though it costed a bit, but I was happy to get my email messages back.

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