http://www.msexchange.org/ has been crawled 804 times going all the way back to January 26, 1998.

A crawl can be a duplicate of the last one. It happens about 25% of the time across 420,000,000 websites. FAQ
Jan
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

January 28, 2011

1 snapshot

28
29
30
31
Feb
1

February 2, 2011

1 snapshot

2

February 3, 2011

1 snapshot

3
4

February 5, 2011

1 snapshot

5
6
7
8
9
10
11
12
13
14
15
16
17
18

February 19, 2011

1 snapshot

19
20
21
22
23
24

February 25, 2011

1 snapshot

25
26
27
28
Mar
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Apr
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
May

May 1, 2011

1 snapshot

1
2
3
4
5
6
7
8
9
10
11

May 12, 2011

1 snapshot

12
13
14
15
16
17
18

May 19, 2011

1 snapshot

19
20
21
22
23
24
25
26
27
28
29
30
31
Jun
1
2
3
4
5
6
7
8
9
10
11
12
13
14

June 15, 2011

1 snapshot

15
16
17
18
19
20
21
22

June 23, 2011

1 snapshot

23
24
25
26
27
28
29
30
Jul
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

July 23, 2011

1 snapshot

23
24
25
26
27
28
29
30
31
Aug
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Sep
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Oct
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Nov
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Dec
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

Note

This calendar view maps the number of times http://www.msexchange.org/ was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.