Hi, I'd like to store a webdav manifest collblob into a database.  Is
there a limit on the size of the blob?  I've seen blobs never going
bigger than 160 bytes even on folders with hundred of thousands of
files.  But seen other blobs always getting bigger and bigger on some
small inboxes with less than a few hundreds emails.

What drives the blob size?

I have some initial answers..

this blob must be some sort of list of ids.  When the folder as
continuous items (as when you copy a bunch of items into another
folder), this list of Ids must be some sort of range (id1-id2).
However, when the folder has lots of activity in it like inbox
folders, holes might be created (when you delete or move items).
Therefore, the blob cannot be a simple range anymore and might
contains a list of range. (id1-id10, id15-id50, etc..).  This would
explain why the blob sometimes grow in size but at other times, keep
the same size no mather how many emails there is in.

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