There are SMS 1.2 sites in the hierarchy that you will be unable to manage after upgrading, because this version of ConfigMgr ...

There are SMS 1.2 sites in the hierarchy that you will be unable to manage after upgrading, because this version of ConfigMgr does not support interoperability with SMS 1.2. You should upgrade these SMS 1.2 sites after you complete the current upgrade.  It is recommended that you delete all SMS 1.2 client discovery data when upgrading. If you don't delete this data now, ConfigMgr may attempt to send offers to unsupported SMS 1.2 clients. This may cause unpredictable behavior until the data is automatically deleted after 60 days.  Do you want to delete the client discovery data associated with these sites?
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