Error Messages when booting Outlook 365

I am experiencing a problem with Outlook 365. Here is the problem: When I start Outlook I get the following error messages:

'Outlook cannot log on. Verify you are connected to the network and are using the proper server and mail box name. The Microsoft Exchange information service in your profile is missing required information. Modify your profile to correct Microsoft Exchange information Service'.

And

‘System resources are critically low. Close some windows.’

I have downloaded and run all  tests of Microsoft support and recovery  assistant on Outlook without any success.

I notice that my Outlook 353 is for 32 bit. My laptop is 64 bit.  I wonder could this be the problem, although it worked perfectly for the last 5 months.