If you don't know how to downgrade, my instructions below should be helpful.
1.) Backup your data. 2.) Review your Outlook Profiles to make sure you have all of your email account information and passwords for those accounts as you will probably have to add them in again after you downgrade. 3.) Export out any calendars, contacts, tasks, notes attached to an OST file. 4.) Have your Microsoft Store account information, email and password ready.
5.) Uninstall your current Office 365 subscription.
6.) Reboot computer.
7.) Log into your Microsoft Store account http://www.microsoftstore.com.
8.) Click on “Digital Content” (it should be at your main screen, far right).
9.) Then click on "install" the orange button. 10,)Click on “Language and install options.” 11.) Click on "Additional install options." 12.) Other versions of Office, select "Version Office 2013 32-bit."
13.) A download will start and installation will begin.
You might notice that your Outlook 2016 profile may be replaced with Outlook 2013. If you launch Outlook you may have everything back as it was or you may have to start from scratch. This is why I remind you in the first steps to have everything backed up.
There may be issues when you are trying to access Outlook or send & receive emails or due to Outlook crash which leads to corrupt or damaged PST file. To eliminate the corruption from your PST file, you need to repair the corrupt Outlook PST file. U…
Please check the video also in regards to recovery of deleted emails from office 365 admin center and through the MFCMAPI tool.
I have mentioned each and every step with the proper steps that need to be taken care of.