Office 365 Series – 003 – Pre Steps for how to migrate from On Premises Exchange to Exchange Online in Office 365?

Now the next step is the migration of On Premises Exchange 2013 solution on the client Office 365 / Exchange Online.

For this there are two options

1 – Password Sync Option

2 – Single Sign On Option

For password synchronization option, you need a tool that will periodically synchronize user’s passwords between on premises Active Directory to Office 365.

With Single Sign on users can log on their machine once, and they will be able to access all the applications on their company network without typing the password. This is called Single Sign on. For this you need ADFS Infrastructure ( at least 4 servers). We will discuss these 2 options in detail in my next blog.

Migrating to Exchange Online:

below are some helpful tools that you can run to see the health of the Exchange and Active Directory of the environment. We usually run these tools to health check the on premises systems so as to ensure we don’t run in issues while migrating in real:

1 – ID Fix Tool : Run the IDFix tool to see issues in the AD like naming conventions and duplicate email entries

2 – AD PowerShell: Install the PowerShell for future coding purpose

3 – AD Connect Tool: Its new name is Microsoft Azure Active Directory Connect tool. This is used for migration.

4 – HRC Client: Run this client from the advance tab in Users in Exchange Online Portal

5 – Create AD and Infrastructure diagrams, and understand the email routing and spam filtering tools – if any

6 – Run the tools and make a formal report with Technical recommendations on how you will be designing the Exchange Online migration.

In my next blog I will talk about how you can connect the on premises Exchange to Exchange Online, and then how to migrate the users. For every organization, the design and structure changes as the systems are different. So the design might work for one company, and for other company you might change it 100%, so it depends on the organization to organization.

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