EWS notes

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Observations on Exchange Server's EWS

Store Id (StoreId format)

// StoreId: <base64>
00000000  2e 00 00 00 00 85 86 83  1a be d9 c1 41 94 c5 5d  |............A..]|
00000010  3d 89 01 75 99 01 00 01  00 00 00 a5 18 7b 6f bc  |=..u.........{o.|
00000020  dc ea 1e d0 3c 56 57 00  00 00 00 00 0f 00 00 01  |....<VW.........|
00000030

uint8_t group_length;
{
    GUID provider_uid?;
    uint16_t ??;
    uint32_t ??;
    GUID store_guid;
    uint32_t ??;
}
uint8_t ??;

Store ID (HexEntryId)

00000000  00 00 00 00 85 86 83 1a  be d9 c1 41 94 c5 5d 3d  |...........A..]=|
00000010  89 01 75 99 01 00 01 00  00 00 a5 18 7b 6f bc dc  |..u.........{o..|
00000020  ea 1e d0 3c 56 57 00 00  00 00 00 0f 00 00        |...<VW........|
0000002e

This is just the center portion of the StoreId form.

Store Id (EwsId base64 form)

00000000  01 03 24 00 37 65 36 31  36 37 35 34 2d 32 37 38  |..$.7e616754-278|
00000010  64 2d 34 39 62 62 00 2d  38 30 35 61 2d 30 66 37  |d-49bb.-805a-0f7|
00000020  38 36 34 66 65 33 64 63  35 00 2e 00 00 03 85 86  |864fe3dc5.......|
00000030  83 1a be d9 c1 41 94 c5  5d 3d 89 01 75 99 01 00  |.....A..]=..u...|
00000040  01 00 00 01 a5 18 7b 6f  bc dc ea 1e d0 3c 56 57  |......{o.....<VW|
00000050  00 00 03 0f 00 00 00                              |.......|
00000057

Store Id (EwsLegacyId base64 form)

00000000  01 00 10 00 75 73 65 72  35 40 67 72 61 6d 6d 01  |....user5@gramm.|
00000010  2e 6e 65 74 00 2e 00 00  03 85 86 83 1a be d9 c1  |.net............|
00000020  41 94 c5 5d 3d 89 01 75  99 01 00 01 00 00 01 a5  |A..]=..u........|
00000030  18 7b 6f bc dc ea 1e d0  3c 56 57 00 00 03 0f 00  |.{o.....<VW.....|
00000040  00 00                                             |..|
00000042

uint16_t something;
uint16_t mbguidlen;
char8_t mailbox_guid[mbguid_len+1];
uint16_t length = 0x2e; /* this u16 included in the length value */
uint16_t ??;
uint8_t ??;
GUID provider_uid;
uint16_t ??;
uint16_t ??;
uint8_t ??[2];
GUID store_guid;

Folder Id

00000000  00 03 24 00 62 62 30 30  66 37 63 66 2d 30 62 39  |..$.bb00f7cf-0b9|
00000010  34 2d 34 66 61 62 2d 38  65 66 35 2d 32 33 31 66  |4-4fab-8ef5-231f|
00000020  30 62 63 34 30 34 31 36  00 2e 00 00 00 00 00 a2  |0bc40416........|
00000030  1e 44 9a 4e 3c d7 4b 98  f2 0f 97 5e 57 37 f0 01  |.D.N<.K....^W7..|
00000040  00 1e de f0 7f 30 72 25  41 8b 15 34 c4 66 23 92  |.....0r%A..4.f#.|
00000050  52 00 00 23 67 48 67 00  00                       |R..#gHg..|
00000059

uint16_t something;
uint16_t mbguidlen;
char8_t mailbox_guid[mbguid_len+1];
uint16_t eid_length = 0x2e;
/* rest is the usual FOLDER_ENTRYID structure (cf. mapi_types.hpp) */

Message Id

00000000  00 03 24 00 62 62 30 30  66 37 63 66 2d 30 62 39  |..$.bb00f7cf-0b9|
00000010  34 2d 34 66 61 62 2d 38  65 66 35 2d 32 33 31 66  |4-4fab-8ef5-231f|
00000020  30 62 63 34 30 34 31 36  00 46 00 00 00 00 00 a2  |0bc40416.F......|
00000030  1e 44 9a 4e 3c d7 4b 98  f2 0f 97 5e 57 37 f0 07  |.D.N<.K....^W7..|
00000040  00 1e de f0 7f 30 72 25  41 8b 15 34 c4 66 23 92  |.....0r%A..4.f#.|
00000050  52 00 00 00 00 01 0f 00  00 1e de f0 7f 30 72 25  |R............0r%|
00000060  41 8b 15 34 c4 66 23 92  52 00 00 23 67 4f 7f 00  |A..4.f#.R..#gO..|
00000070  00                                                |.|
00000071

uint16_t something;
uint16_t mbguidlen;
char8_t mailbox_guid[mbguid_len+1];
uint16_t eid_length = 0x46;
/* rest is the usual MESSAGE_ENTRYID structure (cf. mapi_types.hpp) */

Change Key

00000000  01 00 00 00                                       |....|
00000004

00000000  01 00 00 00 16 00 00 00  1e de f0 7f 30 72 25 41  |............0r%A|
00000010  8b 15 34 c4 66 23 92 52  00 00 23 66 1c 8c        |..4.f#.R..#f..|
0000001e

00000000  09 00 00 00                                       |....|
00000004

00000000  09 00 00 00 16 00 00 00  1e de f0 7f 30 72 25 41  |............0r%A|
00000010  8b 15 34 c4 66 23 92 52  00 00 23 66 04 93        |..4.f#.R..#f..|
0000001e

00000000  0f 00 00 00 16 00 00 00  ee 4e 3b 86 8d 1c 5f 40  |.........N;..._@|
00000010  85 73 42 30 21 88 f1 53  00 00 1e 50 00 0d        |.sB0!..S...P..|
0000001e

uint32_t type;
uint32_t changekey_len = 0x16;
/* rest is the usual PR_CHANGE_KEY format */
GUID dbguid;
uint8_t cn[6]; /* big-endian 48-bit integer */

type=1 for folders, type=9 for messages, type=15 for calendar items. CK may be just 4 bytes in case no CK exists (or so).

Subscription Ids

00000000  1a 00 73 72 76 2d 65 78  63 68 61 6e 67 65 2d 30  |..srv-exchange-0|
00000010  31 2e 67 72 61 6d 6d 6d  2e 6e 65 74 10 00 00 00  |1.grammm.net....|
00000020  23 ec 54 d2 16 4a 59 44  8c 8f 36 c5 07 2d d5 8b  |#.T..JYD..6..-..|
00000030  95 5c e8 88 06 f7 db 08  10 00 00 00 cf f7 00 bb  |.\..............|
00000040  94 0b ab 4f 8e f5 23 1f  0b c4 04 16              |...O..#.....|
0000004c

uint16_t svlength;
char8_t servername[svlength];
uint32_t some_len = 16;
GUID some_guid;
uint64_t timestamp;
uint32_t mailbox_guid_len = 16;
GUID mailbox_guid; /* sense as per glossary.rst */

The GUIDs are of type RFC 4122 §4.1.3, hence guid byte #7's high nibble is always '4', guid byte #8's has always the 0x80 bit set, and guid byte #8 is generally between 0x80..0xbf.

The timestamp is in 100-nanosecond intervals since January 1 year 1 AD. (0x08dbf70688e85c95/10000000/86400/365.25 = 2022.88, date of execution is 2023-12-07, so like 2023.93, the remaining .05 difference is probably unaccounted leap day stuff).