Resource denied recurring meeting request
When the resource room booked for one or more of the dates in a new recurring meeting request, the entire recurring meeting is declined. The Exchange administrator can change this behavior.

Disable the ability to create tentative appointments
Note: this will stop Outlook and Exchange from creating tentative appointments on the calendar automatically, however, the tentative appointment will be created at the time you select the meeting request in your Inbox. Exchange Server 2013 The administrator can use this cmdlet to prevent tentative appointments meeting requests received from users outside of your network.
Meetings are not removed when the invitation is deleted
When a meeting invitation is deleted from the Inbox, the tentative copy of the associated meeting remains in the Calendar.

Choosing a From address in Exchange
Every Exchange user’s mailbox can have many email addresses. Can a user define what email address to appear in the “From” field?
Rules Quota in Office 365 or Exchange 2013
It's been awhile since I've heard complaints about the number of rules available in Exchange server mailboxes - apparently the 64KB rules limit meets the needs of most users much better than the old 32KB limit did, however, it's clearly not large enough for two users who recently moved to Office 365. Because managing a

Office 365 Home Premium winners list
Check out the winners list in our Office 365 Home Premium subscription giveaway.
Monitor secondary mailbox folder for new messages
Use a VBA macro to monitor a folder in a secondary mailbox for new messages.
Exchange Server February 2013 Updates
Days like Tuesday make me glad I'm using Office 365 now, and don't have to mess with updates to Exchange server (or SharePoint). It's someone else's job to install the updates. Both Exchange 2010 and 2007 are affected by the remote code execution vulnerabilities described in Security bulletin MS13-012: Vulnerabilities in Microsoft Exchange Server could
Exchange server: Give FullAccess permission, without AutoMapping
How to give a mailbox user Full Access permission to a mailbox and disable automapping, so the mailbox does not show up in the folder list automatically. .

Create a list of Contact Group members and their phone numbers
How to create a list of contact group (distribution list)members and their phone numbers using an Outlook macro.

