Hi,

One of our clients is updating their client database internally which will result in a set of clients ( around a 100k and possibly in the future more) getting a new Id. Within this migration process we would like to include a step which will do an equivalent migration in target. 

To do this, we are looking for a way to bulk update the mbox3rdPartyID of a bunch of profiles. When researching the admin api of target ( https://developers.adobetarget.com/api/#structure-of-a-target-profile ) we see that there is a bulk update api call, which we today already use in a different usecase, but do not see a way how to use this to change the mbox3rdPartyID.

What is the best approach to tackle this issue?

Our current fallback option, in case of no solution, is to delete all 100k+ profiles and rebuild them from scratch, losing all data until now. 

Kr,

Thomas