<s>
Email	B-Protocol
migration	I-Protocol
is	O
a	O
process	O
in	O
which	O
an	O
email	O
or	O
multiple	O
email	O
messages	O
are	O
migrated	O
from	O
one	O
email	B-Protocol
client	I-Protocol
to	O
another	O
email	B-Protocol
client	I-Protocol
.	O
</s>
<s>
In	O
general	O
,	O
email	B-Protocol
migration	I-Protocol
is	O
required	O
when	O
a	O
user	O
is	O
switching	O
from	O
its	O
current	O
email	B-Protocol
client	I-Protocol
to	O
a	O
new	O
one	O
.	O
</s>
<s>
Usually	O
,	O
email	B-Protocol
clients	I-Protocol
do	O
n't	O
support	O
similar	O
file	O
formats	O
for	O
saving	O
mailbox	O
data	O
.	O
</s>
<s>
Consolidation	O
:	O
email	B-Protocol
migration	I-Protocol
is	O
performed	O
to	O
consolidate	O
multiple	O
accounts	O
into	O
one	O
,	O
for	O
example	O
following	O
an	O
employee	O
's	O
departure	O
.	O
</s>
<s>
Backup	O
:	O
email	B-Protocol
migration	I-Protocol
is	O
performed	O
to	O
back	O
up	O
or	O
preserve	O
data	O
,	O
for	O
example	O
,	O
to	O
ensure	O
legal	O
compliance	O
.	O
</s>
<s>
Coexistence	O
:	O
email	B-Protocol
migration	I-Protocol
is	O
performed	O
for	O
evaluation	O
purposes	O
,	O
for	O
example	O
during	O
a	O
migration	O
pilot	O
.	O
</s>
<s>
Upgrade	B-General_Concept
:	O
email	B-Protocol
migration	I-Protocol
is	O
performed	O
to	O
facilitate	O
an	O
upgrade	B-General_Concept
,	O
for	O
example	O
when	O
deploying	O
a	O
new	O
version	O
of	O
an	O
email	O
system	O
.	O
</s>
<s>
Various	O
technical	O
procedures	O
are	O
normally	O
used	O
to	O
achieve	O
email	B-Protocol
migration	I-Protocol
:	O
</s>
<s>
MX	B-Protocol
record	I-Protocol
modification	O
:	O
this	O
allows	O
a	O
mail	O
server	O
to	O
process	O
emails	O
on	O
behalf	O
of	O
a	O
designated	O
SMTP	B-Protocol
domain	O
.	O
</s>
<s>
Content	O
conversion	O
:	O
this	O
allows	O
content	O
to	O
be	O
converted	O
,	O
for	O
example	O
from	O
TNEF	O
to	O
MIME	B-Protocol
format	O
.	O
</s>
<s>
Property	O
mapping	O
:	O
this	O
allows	O
properties	O
to	O
be	O
mapped	O
,	O
for	O
example	O
from	O
Gmail	B-Application
to	O
Exchange	B-Operating_System
contacts	O
.	O
</s>
<s>
Email	B-Protocol
migration	I-Protocol
solutions	O
may	O
implement	O
different	O
features	O
which	O
determine	O
their	O
suitability	O
for	O
different	O
migration	O
scenarios	O
:	O
</s>
<s>
Supported	O
systems	O
:	O
defines	O
the	O
list	O
of	O
source	O
and	O
destination	O
systems	O
supported	O
(	O
ex	O
:	O
IMAP	B-Protocol
,	O
Gmail	B-Application
,	O
Exchange	B-Operating_System
)	O
.	O
</s>
<s>
Security	O
:	O
allows	O
migrated	O
content	O
to	O
remain	O
secure	O
,	O
for	O
example	O
using	O
TLS	B-Protocol
encryption	I-Protocol
.	O
</s>
