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For users to have the ability to install Office 365 ProPlus on their computers, they must be configured as local administrators. Furthermore, users don't have to be connected to the Internet all the time to use Office 365 ProPlus. They do, however, have to connect every 30 days to prevent Office 365 ProPlus from going into reduced functionality mode.
References:
http://technet.microsoft.com/en-us/library/gg998766(v=office.15).aspx

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References: https://technet.microsoft.com/en-us/library/dd876923(v=exchg.160).aspx

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Explanation

We use the New-Mailbox cmdlet to create a new mailbox. Then we use the Add-RecipientPermission cmdlet to grant the SendAs permission on the mailbox to [email protected].
Box1: We use the -Shared option to create a shared mailbox with the name of Sales1.
Box 2. We use the Add-RecipientPermission to add a permission (in this case SendAs permission) to the Sales1 mailbox.
Box 3. We need to select the SendAs permission to enable User1 to send messages from the Sales1 mailbox Box 4. We need the -Trustee option to enable us to specify that we're granting the SendAs permission to a user ([email protected]).
References:
https://technet.microsoft.com/en-gb/library/ff935839(v=exchg.150).aspx

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Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Explanation

Step 1: Set-MsolGroup
The New-MsolGroup cmdlet adds a new security group to Azure Active Directory.
Step 2: New-Mailbox
Use the New-Mailbox cmdlet to create mailboxes and user accounts at the same time.
Step 3: Set-CalendarProcessing
Use the Set-CalendarProcessing cmdlet to modify calendar processing options for resource mailboxes, which include the Calendar Attendant, resource booking assistant, and calendar configuration. Note that this cmdlet is effective only on resource mailboxes.
References:
https://docs.microsoft.com/en-us/powershell/module/msonline/new-msolgroup?view=azureadps-1.0
https://docs.microsoft.com/en-us/powershell/module/exchange/mailboxes/new-mailbox?view=exchange-ps
https://docs.microsoft.com/en-us/powershell/module/exchange/mailboxes/set-calendarprocessing?view=exchang