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Migrate IMAP mailboxes to Microsoft 365 – Office 365 – Exchange online

Here are the steps required in sequence to migrate an IMAP domain to Exchange Online.

  1. Add the domain to your Microsoft 365 tenant. You don’t have to complete the mail server setup.
  2. Add domain users to Microsoft 365. Each user must have a Microsoft 365 Business Basic, Standard, or Premium license
  3. Prepare the csv file for migration, separated by commas. In the first line put EmailAddress, UserName, Password. In the following lines the data: “EmailAddress is the Microsoft account,” UserName “is the imap server account and” Password “is the imap server password

example of csv

EmailAddress,UserName,Password
terrya@contoso.edu,contoso\terry.adams,1091990
annb@contoso.edu,contoso\ann.beebe,2111991
paulc@contoso.edu,contoso\paul.cannon,3281986
  1. Log in as an administrator in Microsoft 365 and go to the Exchange admin center. (Note: this guide is for the “classic” Exchange administration interface. Select “recipients” on the left; select “migration” at the top.
  2. At the center of the page there is a button with three dots: …. Selecting it, the endpoint is inserted, that is the Imap source server. In the next window add the new endpoint (IMAP).
  3. Create a new migration. launch the migration
  4. once the migration is complete, in the tenant, you can finish configuring the domain for what concerns the mail server, following the instructions on the tenant and changing your dns

The Rules of Migration

You can put all users in a migration. When a migration ends in error, you can delete a user from it and put the same user in another migration. You can have multiple migrations at the same time but the same user cannot exist in more than one migration. Migration can exist for up to 60 days.

It is not a migration

In reality, Microsoft does a more sophisticated operation than a “trivial” migration: it makes a sync. Synchronize entire imap mailbox to Exchange mailbox in one direction (from imap to exchange). It is sophisticated but less effective than a normal migration: it is not in real time but after 24/30 hours. So if you want to replace the mail server, users would lose at least 24 hours of email.

Configuring perspectives

On Outlook clients, you can add the new Exchange account online. It will be the same as the old mailbox, but will be managed by Exchange. For a while you will then have 2 mailboxes that manage the same mail but on different servers: one is the old imap server, the other one the new Exchange server. When the migration is finished and you have also moved the mx records on the dns, you can delete the old mailbox. Before doing this, however, you must also memorize the contacts and the calendar from the “old” to the “new”:

Contacts: select all contacts, right click, select “move” and then “copy to folder …”, Exchange mailbox contacts.

Calendar: To move appointments between 2 calendars: both calendars and drag appointments from old to new.

Problems in migration

If you have any problem you can investigate using PowerShell. First install ExchangeOnlineManagement.

Connect to the tenant:

Connect-ExchangeOnline -UserPrincipalName <your Admin Username>

The password request screen appears.

List of all endpoints in the tenant

get-migrationendpoint|FL

endpoint test

Test-MigrationServerAvailability -Endpoint <Identity of the endpoint from above>

view sync configuration of single user

Get-SyncRequest -Mailbox  <user>

esport migration result for a user

Get-MigrationUserStatistics <user> -IncludeSkippedItems -IncludeReport 
-DiagnosticInfo "showtimeslots, showtimeline, 
verbose" | Export-Clixml C:\temp\MigMyUser.xml

Exchange mailboxes have a 35MB limit. If you have to move something bigger during the migration you have to change this limit.

Set-Mailbox -Identity <user> -MaxReceiveSize 150MB

Documentation:

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Outlook for Exchange online: Change the default address book

Exchange online Outlook accounts has the Global Address List (GAL), as a default address book: the one that contains corporate accounts. To set the user’s address book (conatcts) as default, synchronized on Outlook online, you need to:

  1. open Outlook
  2. at the top of the main page there is an icon-button “Address Book”.
  3. In the window that appears select “tools – options”.
  4. select “Start with contact folder”
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Remove Thunderbird from default email client on Windows

Scenario

Even though Outlook is set as the default email client in Windows, when you use that program’s “Send as email” function it brings out a Thunderbird dialog box instead of Outlook.

Solution

Open regedit. (‘Start’ > Run > type regedit)

Check registry key: HKEY_CURRENT_USER\Software\Clients\Mail

right side double click on ‘Default’ Enter Microsoft Outlook in ‘Value Data’

Windows 10 may have some variants

  1. HKEY_CURRENT_USER\Software\Clients\Mailto
  2. HKEY_CLASSES_ROOT\mailto\shell\open\command
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Acrobat on windows, pdf preview in file explorer

When you browse folders using File Explorer, if you select for example an Excel file, you will be able to preview the file on the right, without opening it. How to get the same by selecting a pdf?

First of all, Adobe Acrobat Reader must be the default application with which you open pdf files. To try it out, just click on a pdf file and see with which application it is opened. If it is not Adobe Acrobat Reader, you have to change this setting by entering “Default apps”.

Adobe Reader configuration

To preview a pdf file in File Explorer, you need to open Adobe Acrobat Reader. On the top left, select the “Edit” menu, choose “Preferences”. Choose “General” in the Categories list. Select the “Enable PDF thumbnail previews in Windows Explorer” check box.”. Restart your pc.

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printing error – windows blue screen – lock and restart computer

We write to let you know that a March 2021 Windows update is creating problems on your computer when printing a document.

When printing, the computer freezes with an error and restarts.

We have personally experienced the problem on Kyocera printers.

Other sites report the problem with Richo, Olivetti, Zebra printers.

In general, these are all printers that use the win32kfull.sys file

Solution

You simply need to uninstall the KB5000802 update

Update

On March 15th Microsoft released an update that fixes the problem: KB5001567

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Opening a csv file in Excel. How to keep all leading zeros in fields

When you open a csv file in Excel, if you have data that contains zero (0) at the beginning, it will be transformed into numbers losing the leading zero. Let’s see how to avoid losing the leading zeros.

Do not open the csv file with Excel. Instead, open Excel with a new sheet. Go to the “Data” tab and press “from text / csv”.

Upload your csv file now. A new window appears which performs a data transformation.

Above you have some important choices.

Excel figured out which the csv file delimiter is. Note: use this procedure also when you are importing data saved in a csv file with a different delimiter from your standard.

Excel tries to figure out the data type for each column “based on the first 200 rows”; I recommend that you select “based on the entire dataset”. This way Excel should understand that the column with zeros contains text and not numbers. Press “Load” to end the procedure or “Transform Data” to force other choices if necessary.