Outlook calendar entries not synced

Hi Experts,

we use EXCHANGE 2013 and we have many user which uses O365.
At the secretary office we have 3 users with same OS and same O365 settings.
The problem is the sync of these mailboxes and calendar entries.

When the boss creates a new calendar entry, the secretary cannot see the entry....sometimes it is synced but after several minutes.
How to fix this issue ?

What is the way to add a mailbox to another account ?
A new account ?
Or a new mailbox in the users account ?
Or just add the mailbox via full access rights on the mailbox ???
Eprs_AdminSystem ArchitectAsked:
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Saif ShaikhServer engineer Commented:
What is the permission on the BOSS calendar for the secretary.

Normally if permission is proper then it should not be any issue with the mailbox. The mailbox is already in O365 so syncing is not an issue.

You can provide full access permission as per your requirement.
Eprs_AdminSystem ArchitectAuthor Commented:
yes the permission is full access.

But the problem is the sync itself...can we do somethng more here ?
Saif ShaikhServer engineer Commented:
So it's not serve side.

Check the outlook sync errors folder to see if we have some information.

Also does it affect all outlook client or only one.

Try to configure this same profile on another computer to see if the problem is machine specific.

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Eprs_AdminSystem ArchitectAuthor Commented:
Thanks for your time.
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