@OZ,
Glad to see that your issue had already been resolved and thanks for sharing the solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others", I'll repost your solution in case you'd like to "Accept" the answer.
["There is not enough system resources" when opening All Rooms in Address Book in Outlook]
Issue Symptom:
My problem is when any user open All Rooms in Address Book there is such an error appears periodicaly one of three times.
Solution:
We need change only Current system location to your country language: Region - Admninistrative - Region Settings
Best regards,
Jarvis