Outlook.exe categorized as trojan due to its connection outbound and modification on registry keys.

Outlook.exe performed all these actions, and due to it, it is shown as Trojan. And As far as it seems all the outbound connection has been to Microsoft. And I would like to know if this action is normal or should I be concered and if so what action should I take. 
Here is the hash of the root cause [ outlook.exe ].
Actions performed by this artifact:
200 DNS lookups
200 File deletions
200 File reads
200 File writes
200 IP connections
200 Registry creations
200 Registry deletions
200 Registry value sets
200 URL accesses
92 Registry value deletions