How to hydrate user accounts in OWA to avoid warning or error in Signature Manager Office 365 Edition

Problem:

In Signature Manager Office 365 Edition, the following warning/error is displayed:

The user must sign in to OWA at least once to create the mailbox so that the signature and settings can be applied

Reason:

For Signature Manager Office 365 Edition to deploy signatures and settings to a user’s OWA account (for either Exchange or Office 365), the user’s profile must have been created in OWA. This is known as ‘hydrating’ a user’s account.

A user’s profile is hydrated the first time they log on to OWA and select their regional options. It is not hydrated when a user accesses their mailbox using an email client such as Outlook - they must log on to the OWA website itself for the mailbox to be hydrated.

Solution:

To avoid the need for all users to log on to the OWA website so their signatures are deployed, you can use PowerShell commands to hydrate a user’s profile. To do this, follow the steps below:

1. Run Windows Powershell.
2. Use the command below to check your execution policy settings:




Get-ExecutionPolicy    

If the execution policy is set to Restricted, change it to RemoteSigned or Unrestricted using the command below:




Set-ExecutionPolicy RemoteSigned    




3. Provide Office 365 Global Administrator credentials using the command below:




$LiveCred = Get-Credential    




4. To connect to Exchange Online (Office 365):




$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $LiveCred -Authentication Basic -AllowRedirection    




5. Start the connection using the command below:




Import-PSSession $Session    




6. Once connected, run the following command to hydrate a user’s mailboxes:




Get-Mailbox <user> | Set-MailboxRegionalConfiguration -TimeZone "<Time Zone>" –Language <Language>  -DateFormat "<Date Format>"    




Replace <user> with the user’s account, <Time Zone> with the user’s time zone name, <Language> with the Language Culture Name, and <Date Format> with the required date format (retain quotes where shown).




For example, for a user in the UK:




Get-Mailbox uksales@example.co.uk | Set-MailboxRegionalConfiguration -TimeZone "GMT Standard Time" –Language en-GB  -DateFormat "dd/MM/yyyy"    

For example, for a user in the US Central time zone:





Get-Mailbox ussales@example.com | Set-MailboxRegionalConfiguration -TimeZone "Central Standard Time" –Language en-US  -DateFormat "MM/dd/yyyy"    

Variations

Commands detailed in step 2 above show how to a hydrate mailboxes for specified users. However, if required you can hydrate mailboxes for all users, using the command below:

Get-Mailbox -ResultSize unlimited | Set-MailboxRegionalConfiguration -TimeZone "<Time Zone>" –Language <Language> -DateFormat "<Date Format>"

For example, if all of your users are in the UK, you can use the command below to hydrate all users’ mailboxes:

Get-Mailbox -ResultSize unlimited | Set-MailboxRegionalConfiguration -TimeZone "GMT Standard Time" –Language en-GB  -DateFormat "dd/MM/yyyy"

If you have users in multiple different time zones, or that require different language options, you can use other input parameters available for the Get-Mailboxcmdlet to apply settings to a group or subset of users.