The various picture resolutions supported by Exchange 2013 mailboxes

In researching what picture resolutions are supported by Exchange (and Lync 2013/Skype for business) I came across this MS Technet article stating the the following 3 resolutions used in Lync:

• 48 x 48 : Used if no higher resolution image is selected
• 96 x 96 : Used in Outlook Web App and Outlook 2013
• 648 x 648 : Used in Lync 2013 desktop client and Lync 2013 Web App

I also came across this MSDN article detailing an EWS URL you can use to retrieve the photo used in an Exchange 2013 mailbox : https://Exchange Server/ews/Exchange.asmx/s/GetUserPhoto?email=email address&size=size code
In working on a script to pull pictures from my company’s HR system and push them to user’s mailboxes, I noticed other resolutions were available as well. So I decided to try and figure out all the supported resolutions with this quick and dirty PoweShell script:

Foreach ($Num in 1..648) {
   Try {
      $URL = "http://contoso.com/EWS/Exchange.asmx/s/GetUserPhoto?email=John.Mello@contoso.com&size=HR$($Num)x$($Num)" Invoke-WebRequest -Uri $URL -UseDefaultCredentials -ErrorAction stop | Out-NUll
      $Num
   }
   Catch{ } 
}

In doing so I discovered that these were all the supported resolutions in Exchange 2013:

• 48×48
• 64×64
• 96×96
• 120×120
• 240×240
• 360×360
• 432×432
• 504×504
• 648×648