I hope the list would give this a read. I have no doubt many applications on Mobile Devices will get it wrong, but that is no excuse for Thunderbird (or Modzilla) to get it wrong too.
[ANN] Meta Data Round-Tripping & Privacy
Free White Paper
From the Foreword ...
The trouble with meta data round trips between formats is the same
problem with meta data round trips between “displays” which may hide
meta data from view. While the results are common in real life,
a similar name on a “no fly” list causing a missed flight
(a mis-identification), or a targeted advertisementt way off
target ( a mis –re-identificationn), the root cause is simply
that a format conversion confuses the distinction between
“exposed” and “unseen”. In the case of re-identification, the issue
comes up as an identifier deletion when a data redaction was
intended.
The CSVplus Data Base is a generalized model of a CSV Format Spreadsheet.
Fully exposed meta data elements are added to the CSV Format
to prevent the unintentional deletion of identifiers.
While this format has an obvious application for Application
User Data and Address Books, it can also be used on other data sets,
for example, Web Forms or Social Networking Site Profiles,
or even Paper Forms.
Download from: http://www.rustprivacy.org/meta/roundtripping.pdf